ProFTPD FTP Command Handling Symlink Arbitrary File Overwrite
Low Nessus Plugin ID 66970
SynopsisThe remote FTP server is affected by an arbitrary file overwrite vulnerability.
DescriptionThe remote host is using ProFTPD, a free FTP server for Unix and Linux. According to its banner, the version of ProFTPD installed on the remote host earlier than 1.3.4c. As such, it is potentially affected by a race condition error that does not securely create temporary files related to symlinks and newly created directories. A local, attacker could leverage this issue to overwrite arbitrary files and elevate privileges.
Note that Nessus did not actually test for the flaw but has instead relied on the version in ProFTPD's banner.
SolutionUpgrade to 1.3.4c / 1.3.5rc1 or apply the patch from the vendor.